quote:The STS-115 crew, Commander Brent Jett, Pilot Chris Ferguson, and mission specialists Joe Tanner, Dan Burbank, Heide Stefanyshyn-Piper and Canadian astronaut Steve MacLean, is in Houston conducting launch simulations. The astronauts will return to Kennedy on Saturday morning. They already have begun adjusting their sleep cycles to match their timeline in orbit that changed due to the new launch time.